<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>无标题文档</title>
    <style>
        *{ padding:0; margin:0;}
        div{ width:100px; height:100px; background:red; position:absolute; left:0; top:0;}
        .tip{width:80px; height:80px; border:10px dotted blue; position:absolute; top:0; left:0 }
    </style>
    <script src="bundle.js"></script>

</head>

<body>
<div></div>
</body>
</html>

</body>
</html>